Harrold, whose side are unbeaten in League Two this season, should have made it 2-0 soon afterwards, but he fluffed an easy header from a corner just eight yards out.

The striker grabbed his second nine minutes before half-time, racing on to Matt Phillips' flick-on and rounding keeper Andy Little to score. He also hit the inside of the post in first-half injury-time.

Wimbledon hit back after 56 minutes when Sam Hatton, their hero of the last qualifying round, side-footed home Davis's cross at the far post.

But Peter Taylor's visitors restored their two-goal lead six minutes later when Phillips tucked home John Mousinho's pass to make it 3-1.

Harrold completed his hattrick in the 74th minute to give Wycombe a trip to another non-League outfit, Eastwood Town, in the second round.